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		</style><hr><a name="_C_FUNCGENERATOR"><div style="background-color:yellow;font-family:courier new;"></a>CLASS <b>FuncGenerator</b></div>
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<i>(Defined in: jpgraph.php : 676)</i><table border=1><tr><td>&nbsp;<a href="FuncGenerator.html" style="font-family:arial;font-weight:bold;color:darkblue;">FuncGenerator</a>&nbsp;</td></tr><tr><td valign=top>&nbsp;<a href="FuncGenerator.html#_FUNCGENERATOR_E">E()</a>&nbsp;<br>
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&nbsp;<a href="FuncGenerator.html#_FUNCGENERATOR_FUNCGENERATOR">FuncGenerator()</a>&nbsp;<br>
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</td></tr></table>&nbsp;<p><div style="font-weight:bold;font-family:arial;font-size:100%;">Class usage and Overview</div>A utility class to help with function plots. This class supprots both ordinary one-variable plots with one dependent variable as well as polar plots.
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Basically you create an instance of this class with the function you want to plot as a string argument. The function should be created using 'x' as the independent variable. You then invoke its evaluation method 'E()' with the range for the independent variable and possibly a step size. The method then returns an array of X, and Y values that represents the plot.
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Please remember that the string should be specified with single quotes since otherwise PHP will try to interpret the variable in the string.
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For example, to specify a simple cos() plot you specify:
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$f = new FuncGenerator('cos($x)';
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 <p> &nbsp;
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<hr><span style="font-family:arial;font-size:120%;font-weight:bold;">Class Methods</span><hr><p>
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<p>&nbsp; <p> &nbsp; <span style='font-size:110%;'><a name="_FUNCGENERATOR_E"><div style="border-top:solid black 2pt;background-color:lightblue;font-family:courier new;font-size:90%;font-weight:bold;"><b><font color="#000000">
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function&nbsp;E($aXMin,$aXMax,$aSteps)</font>
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</b></div></a></span>
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<span style='font-family:arial;font-size:90%;'><i>Evaluate a X-Y function</i></span><p>
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<table cellspacing=0 style='border:black solid 1pt;' width=100%>
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<tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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$aXMin</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'>&nbsp;</td><td>Min x-value</td></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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$aXMax</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'>&nbsp;</td><td>Max x-value</td></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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$aSteps</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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50</font>
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</td><td>Number of steps</td></tr>
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</table>
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<div style="font-weight:bold;font-family:arial;font-size:85%;">Description</div>Evaluate the previous specified function between the specified values. The return two arrays representing the X and Y coordinates for the function.&nbsp;<br>
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<div style="font-weight:bold;font-family:arial;font-size:85%;"><p>Example</div><span style="font-family:courier;font-size:85%;"><font color="#000000">
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//&nbsp;Create&nbsp;a&nbsp;simple&nbsp;linear&nbsp;plot
<br />$f&nbsp;=&nbsp;new&nbsp;FuncGenerator('cos($x)&nbsp;*&nbsp;sin($x)');
<br />list($xdata,$ydata)&nbsp;=&nbsp;$f-&gt;E(-2*M_PI,&nbsp;2*M_PI);
<br />
<br />$lp1&nbsp;=&nbsp;new&nbsp;LinePlot($ydata,$xdata);
<br />
<br />//&nbsp;Create&nbsp;a&nbsp;simple&nbsp;polar&nbsp;plot&nbsp;(a&nbsp;circle)
<br />$p&nbsp;=&nbsp;new&nbsp;FuncGenerator('cos($i)',&nbsp;'sin($i)');
<br />list($x2data,$y2data)&nbsp;=&nbsp;$f-&gt;E(-2*M_PI,&nbsp;2*M_PI);
<br />
<br />$lp2&nbsp;=&nbsp;new&nbsp;LinePlot($y2data,$x2data);
<br />
<br />//...</font>
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</span><br>
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<p>
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<p>&nbsp; <p> &nbsp; <span style='font-size:110%;'><a name="_FUNCGENERATOR_FUNCGENERATOR"><div style="border-top:solid black 2pt;background-color:lightblue;font-family:courier new;font-size:90%;font-weight:bold;"><b><font color="#000000">
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function&nbsp;FuncGenerator($aFunc,$aXFunc)</font>
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</b></div></a></span>
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<span style='font-family:arial;font-size:90%;'><i>Create a new function generator.</i></span><p>
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<table cellspacing=0 style='border:black solid 1pt;' width=100%>
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<tr><th width=25%>Argument</th><th width=15%>Default</th><th width=60%>Description</th></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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$aFunc</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'>&nbsp;</td><td>Function</td></tr>
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<tr><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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$aXFunc</font>
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</td><td style='border-right:black solid 1pt;font-family:courier;font-size:90%;font-weight:bold;'><font color="#000000">
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</td><td>X-Function</td></tr>
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</table>
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<div style="font-weight:bold;font-family:arial;font-size:85%;">Description</div>Creates a new funciton generator. You can create both a linear plot as well as polar plot.
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For linear, one-variable plots, you must use '$x' as the independent variable.
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For polar plots you should use the index '$i' for the generating functions.
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&nbsp;<br>
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<div style="font-weight:bold;font-family:arial;font-size:85%;"><p>Example</div><span style="font-family:courier;font-size:85%;"><font color="#000000">
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//&nbsp;Create&nbsp;a&nbsp;simple&nbsp;linear&nbsp;plot
<br />$f&nbsp;=&nbsp;new&nbsp;FuncGenerator('cos($x)&nbsp;*&nbsp;sin($x)');
<br />list($xdata,$ydata)&nbsp;=&nbsp;$f-&gt;E(-2*M_PI,&nbsp;2*M_PI);
<br />
<br />$lp1&nbsp;=&nbsp;new&nbsp;LinePlot($ydata,$xdata);
<br />
<br />//&nbsp;Create&nbsp;a&nbsp;simple&nbsp;polar&nbsp;plot&nbsp;(a&nbsp;circle)
<br />$p&nbsp;=&nbsp;new&nbsp;FuncGenerator('cos($i)',&nbsp;'sin($i)');
<br />list($x2data,$y2data)&nbsp;=&nbsp;$f-&gt;E(-2*M_PI,&nbsp;2*M_PI);
<br />
<br />$lp2&nbsp;=&nbsp;new&nbsp;LinePlot($y2data,$x2data);
<br />
<br />//...
<br /></font>
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</span><br>
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<p> <hr> <p>